# print([1,2,3]*3)#[1, 2, 3, 1, 2, 3, 1, 2, 3]
# [6,7,9,11]
# -1
#print(list(range(1,10,3))) #[1, 4, 7]
#print(int(4**0.5)) 2
# str ='a*bc*d'
# print(str.split('*')) ['a', 'bc', 'd']

# x=['a','b','c']
# #del x[0]
# x.remove('a')
# print(x)

# dic = {'a':'bb','c':5}
# dic['pos']=(3,5)
# print(dic)

#动态技术

#white flowers


# list = []
# for i in range(1, 5):
#     for j in range(1, 5):
#         for k in range(1, 5):
#             if (i != j) and (j != k) and (i != k):
#                 a = int("%s%s%s" % (i, j, k))
#                 list.append(a)
# print(list)


# if int("a")|int("b") in [1,2,3,4,5]:
#      print(111)

# -*-coding:utf8-*-
# import requests
# from lxml import etree
#
# url="http://econpy.pythonanywhere.com/ex/001.html"
# page=requests.get(url)
# html=page.text
# selector = etree.HTML(html)
# for x in(0,10):
#
#     news=selector.xpath('/*[@id="1"]/h3/a')
#     news_line=selector.xpath('//*[@id="1"]/h3/a/@href')
#
#     print (news)
#     print (news_line)
#

from datetime import datetime

print()